The physical effects of a muscle twitch last longer than the action potential that triggered the contraction because
A) muscle fibers lack elasticity.
B) it takes time to extrude calcium ions out of the fiber.
C) the acetylcholine molecules are slowly cleared from the neuromuscular junction.
D) the twitches run back and forth along the muscle fiber.
E) muscle fibers are thicker than axons.

Question

Quizplus · Accepted Answer

Muscle twitch is triggered by the release of calcium ions into the muscle fibers. After the contraction, it takes time to pump these calcium ions out of the fibers, resulting in muscle relaxation. This process takes longer than the action potential that triggered the twitch, therefore the physical effects of a twitch last longer.

The Physical Effects of a Muscle Twitch Last Longer Than